<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			.header{
				width: 1000px;
				height: 100px;
				background-color: red;
				text-align: center;
				margin: 0 auto;
				font-size: 40px;
			}
			.content{
				width: 1000px;
				height: 500px;
				background-color: yellow;
				text-align: center;
				margin: 0 auto;
				font-size: 40px;
				
			}
			.nav{
				width: 1000px;
				height: 100px;
				background-color: green;
				text-align: center;
				margin: 0 auto;
				font-size: 40px;
			}
			
		.content .content_left{
				width: 200px;
				height: 500px;
				background-color: olivedrab;
				text-align: center;
				float: left;
				font-size: 40px;
		}
		.content .content_right{
				width: 800px;
				height: 500px;
				background-color:blue;
				text-align: center;
				float: left;
				font-size: 40px;
		}
		.footer{
				width: 1000px;
				height: 200px;
				background-color: black;
				text-align: center;
				font-size: 40px;
				color: white;
				margin: 0 auto;
		}

		</style>
	</head>
	<body>
		<div class="header">头部</div>
		<div class="nav">导航</div>
		<div class="content">
			<div class="content_left"></div>
			<div class="content_right"></div>
		</div>
		<div class="footer">底部</div>
		
		
	</body>
</html>
